/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.pos.net.base;

/**
 * Default retry policy for requests.
 */
public class DefaultRetryPolicy implements RetryPolicy {
	/** The current timeout in milliseconds. */
	private int mCurrentTimeoutMs;

	/** The current retry count. */
	private int mCurrentRetryCount;

	/** The maximum number of attempts. */
	private final int mMaxNumRetries;

	/** The backoff multiplier for for the policy. */
	private final float mBackoffMultiplier;

	/** The default socket timeout in milliseconds */
	public static int DEFAULT_TIMEOUT_MS = 2500;

	/** The default number of retries */
	public static int DEFAULT_MAX_RETRIES = 1;

	/** The default backoff multiplier */
	public static final float DEFAULT_BACKOFF_MULT = 1f;

	/**
	 * Constructs a new retry policy using the default timeouts.
	 */
	public DefaultRetryPolicy() {
		this(DEFAULT_TIMEOUT_MS, DEFAULT_MAX_RETRIES, DEFAULT_BACKOFF_MULT);
	}

	/**
	 * set retry num and timeOut
	 */
	public static void setRetryAndTimeOut(int retry, int timeOut) {
		DEFAULT_MAX_RETRIES = retry;
		DEFAULT_TIMEOUT_MS = timeOut * 1000;
	}

	/**
	 * Constructs a new retry policy.
	 * 
	 * @param initialTimeoutMs
	 *            The initial timeout for the policy.
	 * @param maxNumRetries
	 *            The maximum number of retries.
	 * @param backoffMultiplier
	 *            Backoff multiplier for the policy.
	 */
	public DefaultRetryPolicy(int initialTimeoutMs, int maxNumRetries,
			float backoffMultiplier) {
		mCurrentTimeoutMs = initialTimeoutMs;
		mMaxNumRetries = maxNumRetries;
		mBackoffMultiplier = backoffMultiplier;
	}

	/**
	 * Returns the current timeout.
	 */
	@Override
	public int getCurrentTimeout() {
		return mCurrentTimeoutMs;
	}

	/**
	 * Returns the current retry count.
	 */
	@Override
	public int getCurrentRetryCount() {
		return mCurrentRetryCount;
	}

	/**
	 * Prepares for the next retry by applying a backoff to the timeout.
	 * 
	 * @param error
	 *            The error code of the last attempt.
	 */
	@Override
	public void retry(VolleyError error) throws VolleyError {
		mCurrentRetryCount++;
		mCurrentTimeoutMs += (mCurrentTimeoutMs * mBackoffMultiplier);
		if (!hasAttemptRemaining()) {
			throw error;
		}
	}

	/**
	 * Returns true if this policy has attempts remaining, false otherwise.
	 */
	protected boolean hasAttemptRemaining() {
		return mCurrentRetryCount <= mMaxNumRetries;
	}
}
